<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 2.为 ECharts 准备一个定义了宽高的 DOM -->
            <div id="main" style="width: 750px; height: 400px"></div>
        </el-card>
    </div>
</template>

<script>
    // 1.引入刚刚下载的 ECharts 文件
    // import echarts from 'echarts';
    import * as echarts from 'echarts';
    import _ from 'lodash';

    export default {
        name: 'Report',
        data() {
            return {
                // 需要合并的数据
                options: {
                    title: {
                        text: '用户来源',
                    },
                    tooltip: {
                        trigger: 'axis',
                        axisPointer: {
                            type: 'cross',
                            label: {
                                backgroundColor: '#E9EEF3',
                            },
                        },
                    },
                    grid: {
                        left: '3%',
                        right: '4%',
                        bottom: '3%',
                        containLabel: true,
                    },
                    xAxis: [
                        {
                            boundaryGap: false,
                        },
                    ],
                    yAxis: [
                        {
                            type: 'value',
                        },
                    ],
                },
            };
        },
        created() {},
        // 此时页面上的元素 已经被渲染完毕了!
        async mounted() {
            // 3. 基于准备好的dom，初始化echarts实例
            var myChart = echarts.init(document.getElementById('main'));

            const { data: res } = await this.$http.get('reports/type/1');
            if (res.meta.status !== 200) {
                return this.$message.error('获取折线图数据失败');
            }

            // 4.准备数据和配置项
            const result = _.merge(res.data, this.options);
            // 5. 展示数据
            myChart.setOption(result);
        },
        methods: {},
    };
</script>

<style lang="less" scoped></style>
